Was a huge fan of Young Justice so that's the group I'd really like to see done (though I think I'd prefer the most recent looks for the characters), but some of the more obscure Titans would be great, too, and I second Power Guy's vote for Joker's Daughter (again, most recent look, please)...

I really want to see more of the obscure Titans and Young Justice made than anything, because the NTT characters are a given anyway. I prefer modern looks, and if we do see some classic NTT designs for someone like Nightwing or Red Arrow/Arsenal/Speedy, I'd rather they show up in two-packs (those things were such a great idea) than the main line. Save space for characters that surprise us.